[Cob] straw clay in floors

[ROBERT ALCOCK]

Hi all,

We're deciding what kind of insulation to put in the subfloor of the new cob/straw bale houses we're building in northern Spain (http://abrazohouse.org/the-place/buildings/el-manzanal/)

The options we're looking at are either (a) vermiculite or expanded clay, or (b) light straw clay.

Does anyone have experience of using light straw clay in a subfloor (underneath a cob floor)?

We would be using a plastic vapour barrier, perhaps with the addition of a gravel drainage layer on top of the plastic.

Of course we are concerned about the moisture hazard. Any advice would be more than welcome!

Yours in cob,

Robert http://abrazohouse.org